Fulfilment by Amazon (FBA) is a service Amazon offers sellers that lets them store their products in Amazon's warehouses, and Amazon directly does the picking, packing, shipping and customer service on these items. Something Amazon hopes you'll especially enjoy: FBA items are eligible for and for Amazon Prime just as if they were Amazon items.

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World Famous WarrantyAt Anker, we believe in our products. That's why we back them all with an 18-month warranty and provide friendly, easy-to-reach support.

For Optimal Use:• Use the included cable, your original cable or a third-party certified one (such as MFi).• Compatible with Apple and Android smartphones, tablets (including the Nexus 7) and other USB-charged devices except for the iPod nano, iPod Classic, HP TouchPad, LG G2, Asus and some GPS and Bluetooth devices.• Do not try to recharge the Astro E3 while it's charging a device, as this may reduce the battery's lifespan.

Edit Please note this is for the older version, NOT for the new E version (despite what the Amazon page says). Also I corrected my maths, as pointed out by Ms L Atkins. Thanks for that, I missed out some brackets!

So how many times can you charge your phone? This battery is 70% efficient (nothing is ever 100%). According to their website (ianker.com) use this formula.

In testing I achieved 4 full charges from 0% to 100%, & 1 more charge from 0% to 54% before the Astro 3 was totally flat.

It took 2 1/2 hours to fully charge my phone using the S USB slot. It took 3 hours to fully charge my phone using the I USB slot.(Using the wall charger that came with my phone, it takes 1 1/2 hours to charge my phone from 0% to 100%)

2 USB slots can charge up to 2A (@5V). USB Slot I is for Apple devices, USB Slot S is for Samsung (read Android) devices. Both slots work for any USB device I have tried that is 5V.This also has a DC out slot that is switchable between 9V & 12V.

Your device will only draw UP TO the Amps that it is designed for. In other words if your wall charger is 1A 5V, it is ok to use this external battery, your device will only draw 1A. The external battery itself can supply up to 2A depending on your device, just make sure its 5V.

I also tried charging my netbook, an EeePC (1000HE) made by Asus, with an 8400 mAh battery that lasts for around 7 hours.Read more ›

I'm very satisfied about this external battery.It is very handy during conferences or when I'm moving a lot during the day and I don't have the chance to connect my smartphone to a power source.The 10000 mAh capacity is enough for at least 4 charges of my Nexus 5 and the output (3000 mA) is very fast: it is easily possible to use the smartphone with highly consuming applications, such as GPS navigation, and still charging it using this battery.I highly recommend it.

These things are actually fantastic. I was sceptical at first but threw caution to the wind due to the low price and my imminent departure from the country and I was not disappointed.

I'm aware that often portable charging devices can lack in pretty much every department and I'm especially distrusting of brand names I've never heard of before, but not this one. it does take some time to charge. From almost empty I usually have to put it on before I go to bed and then take it off charge when I get home the next day. But from that you can get around 4 and a half full charges for a smartphone. I've used it with an HTC One X, a Samsung Galaxy S2, Samsung Galaxy S4 and probably an iPhone or two at some point and it charges them no problem in the same amount of time you'd expect from charging at the mains. It has two USB ports, one optimised for charging Android phones and one for charging IOS devices (something to do with the way the different operating systems distribute power). It also holds the power very well.

Supplied, you get the unit itself, a nice cloth baggy and a USB cable. It does only come supplied with a micro USB cable, not an iphone cable but if Apple would get their figurative head out of their metaphorical arse and join the rest of the world using micro USB then this wouldn't be a problem. The whole thing is packaged up very nicely and comes with very clear and concise instructions and information (including detail about how the whole Android/Apple ports work).

Only bad thing I have to say is that the nice shiny finish does scratch up something terrible but obviously this doesn't impact the way the thing works so not a serious issue. Other than that this thing saved my arse more than once out in the styx in Northern Thailand with a dying phone battery. Actually bought my friend one as a present recently.

On the positive side this is more robust and has a much better quality finish than the Winten and it charges my Nexus 7 and Galaxy S3 faster, probably because of the dedicated Android charging circuits in the left hand side USB port. For example charging my Nexus 7 from 71% to 100% took 38 minutes and the Galaxy S3 from 68% to 100% took 32 minutes. These times are pretty good for an external battery pack. Another massive plus for me is that this unit will charge my third party extra capacity battery in my S3 to 100% where the Winten stopped at around 82 - 92% I also used it to power my S3 overnight while running a 'sleep' application. It was 70% charged when I went to bed and 100% in the morning, the unit had powered the phone all night without switching off when it reached 100% (exactly what I wanted) the Winten would switch itself off once it detected maximum charge had been reached. In any case the charge to 100% and running the phone for 7 hours caused 1 light to go out or 25% of the charge to be used.

The downside is that this unit takes nearly twice as long as the Winten to charge from my wall charger. I have tried a couple of different wall chargers and there is little difference. While this is an excellent battery pack please give yourself plenty of time to charge it. It took 7 hours from 2 lights out to 4 lights on.